Dont copy code

Well it hits me so often… I’m using copy&paste to build similar code. And then it fires me back, when I made some stupid typo. Finding case of such errors is usually very annoying…

I was adding several fields to table in Rails application. I wrote migrations self.up and used this as a skeleton for remove_column in self.down. Of course I have left one coma to much, and struggled over 20 minutes to find what was wrong…

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